diff --git a/tests/test_curve.h b/tests/test_curve.h
new file mode 100644
index 00000000000..55f2d9a367d
--- /dev/null
+++ b/tests/test_curve.h
@@ -0,0 +1,222 @@
+/*************************************************************************/
+/*  test_curve.h                                                         */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef TEST_CURVE_H
+#define TEST_CURVE_H
+
+#include "scene/resources/curve.h"
+
+#include "thirdparty/doctest/doctest.h"
+
+namespace TestCurve {
+
+TEST_CASE("[Curve] Default curve") {
+	const Ref<Curve> curve = memnew(Curve);
+
+	CHECK_MESSAGE(
+			curve->get_point_count() == 0,
+			"Default curve should contain the expected number of points.");
+	CHECK_MESSAGE(
+			Math::is_zero_approx(curve->interpolate(0)),
+			"Default curve should return the expected value at offset 0.0.");
+	CHECK_MESSAGE(
+			Math::is_zero_approx(curve->interpolate(0.5)),
+			"Default curve should return the expected value at offset 0.5.");
+	CHECK_MESSAGE(
+			Math::is_zero_approx(curve->interpolate(1)),
+			"Default curve should return the expected value at offset 1.0.");
+}
+
+TEST_CASE("[Curve] Custom curve with free tangents") {
+	Ref<Curve> curve = memnew(Curve);
+	// "Sawtooth" curve with an open ending towards the 1.0 offset.
+	curve->add_point(Vector2(0, 0));
+	curve->add_point(Vector2(0.25, 1));
+	curve->add_point(Vector2(0.5, 0));
+	curve->add_point(Vector2(0.75, 1));
+
+	CHECK_MESSAGE(
+			Math::is_zero_approx(curve->get_point_left_tangent(0)),
+			"get_point_left_tangent() should return the expected value for point index 0.");
+	CHECK_MESSAGE(
+			Math::is_zero_approx(curve->get_point_right_tangent(0)),
+			"get_point_right_tangent() should return the expected value for point index 0.");
+	CHECK_MESSAGE(
+			curve->get_point_left_mode(0) == Curve::TangentMode::TANGENT_FREE,
+			"get_point_left_mode() should return the expected value for point index 0.");
+	CHECK_MESSAGE(
+			curve->get_point_right_mode(0) == Curve::TangentMode::TANGENT_FREE,
+			"get_point_right_mode() should return the expected value for point index 0.");
+
+	CHECK_MESSAGE(
+			curve->get_point_count() == 4,
+			"Custom free curve should contain the expected number of points.");
+
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(-0.1), 0),
+			"Custom free curve should return the expected value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(0.1), 0.352),
+			"Custom free curve should return the expected value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(0.4), 0.352),
+			"Custom free curve should return the expected value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(0.7), 0.896),
+			"Custom free curve should return the expected value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(1), 1),
+			"Custom free curve should return the expected value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(2), 1),
+			"Custom free curve should return the expected value at offset 0.1.");
+
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(-0.1), 0),
+			"Custom free curve should return the expected baked value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(0.1), 0.352),
+			"Custom free curve should return the expected baked value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(0.4), 0.352),
+			"Custom free curve should return the expected baked value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(0.7), 0.896),
+			"Custom free curve should return the expected baked value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(1), 1),
+			"Custom free curve should return the expected baked value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(2), 1),
+			"Custom free curve should return the expected baked value at offset 0.1.");
+
+	curve->remove_point(1);
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(0.1), 0),
+			"Custom free curve should return the expected value at offset 0.1 after removing point at index 1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(0.1), 0),
+			"Custom free curve should return the expected baked value at offset 0.1 after removing point at index 1.");
+
+	curve->clear_points();
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(0.6), 0),
+			"Custom free curve should return the expected value at offset 0.6 after clearing all points.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(0.6), 0),
+			"Custom free curve should return the expected baked value at offset 0.6 after clearing all points.");
+}
+
+TEST_CASE("[Curve] Custom curve with linear tangents") {
+	Ref<Curve> curve = memnew(Curve);
+	// "Sawtooth" curve with an open ending towards the 1.0 offset.
+	curve->add_point(Vector2(0, 0), 0, 0, Curve::TangentMode::TANGENT_LINEAR, Curve::TangentMode::TANGENT_LINEAR);
+	curve->add_point(Vector2(0.25, 1), 0, 0, Curve::TangentMode::TANGENT_LINEAR, Curve::TangentMode::TANGENT_LINEAR);
+	curve->add_point(Vector2(0.5, 0), 0, 0, Curve::TangentMode::TANGENT_LINEAR, Curve::TangentMode::TANGENT_LINEAR);
+	curve->add_point(Vector2(0.75, 1), 0, 0, Curve::TangentMode::TANGENT_LINEAR, Curve::TangentMode::TANGENT_LINEAR);
+
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->get_point_left_tangent(3), 4),
+			"get_point_left_tangent() should return the expected value for point index 3.");
+	CHECK_MESSAGE(
+			Math::is_zero_approx(curve->get_point_right_tangent(3)),
+			"get_point_right_tangent() should return the expected value for point index 3.");
+	CHECK_MESSAGE(
+			curve->get_point_left_mode(3) == Curve::TangentMode::TANGENT_LINEAR,
+			"get_point_left_mode() should return the expected value for point index 3.");
+	CHECK_MESSAGE(
+			curve->get_point_right_mode(3) == Curve::TangentMode::TANGENT_LINEAR,
+			"get_point_right_mode() should return the expected value for point index 3.");
+
+	ERR_PRINT_OFF;
+	CHECK_MESSAGE(
+			Math::is_zero_approx(curve->get_point_right_tangent(300)),
+			"get_point_right_tangent() should return the expected value for invalid point index 300.");
+	CHECK_MESSAGE(
+			curve->get_point_left_mode(-12345) == Curve::TangentMode::TANGENT_FREE,
+			"get_point_left_mode() should return the expected value for invalid point index -12345.");
+	ERR_PRINT_ON;
+
+	CHECK_MESSAGE(
+			curve->get_point_count() == 4,
+			"Custom linear curve should contain the expected number of points.");
+
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(-0.1), 0),
+			"Custom linear curve should return the expected value at offset -0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(0.1), 0.4),
+			"Custom linear curve should return the expected value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(0.4), 0.4),
+			"Custom linear curve should return the expected value at offset 0.4.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(0.7), 0.8),
+			"Custom linear curve should return the expected value at offset 0.7.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(1), 1),
+			"Custom linear curve should return the expected value at offset 1.0.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(2), 1),
+			"Custom linear curve should return the expected value at offset 2.0.");
+
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(-0.1), 0),
+			"Custom linear curve should return the expected baked value at offset -0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(0.1), 0.4),
+			"Custom linear curve should return the expected baked value at offset 0.1.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(0.4), 0.4),
+			"Custom linear curve should return the expected baked value at offset 0.4.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(0.7), 0.8),
+			"Custom linear curve should return the expected baked value at offset 0.7.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(1), 1),
+			"Custom linear curve should return the expected baked value at offset 1.0.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(2), 1),
+			"Custom linear curve should return the expected baked value at offset 2.0.");
+
+	ERR_PRINT_OFF;
+	curve->remove_point(10);
+	ERR_PRINT_ON;
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate(0.7), 0.8),
+			"Custom free curve should return the expected value at offset 0.7 after removing point at invalid index 10.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(curve->interpolate_baked(0.7), 0.8),
+			"Custom free curve should return the expected baked value at offset 0.7 after removing point at invalid index 10.");
+}
+
+} // namespace TestCurve
+
+#endif // TEST_CURVE_H
diff --git a/tests/test_main.cpp b/tests/test_main.cpp
index b4ddf0f1c1a..fce14858e85 100644
--- a/tests/test_main.cpp
+++ b/tests/test_main.cpp
@@ -37,6 +37,7 @@
 #include "test_class_db.h"
 #include "test_color.h"
 #include "test_command_queue.h"
+#include "test_curve.h"
 #include "test_expression.h"
 #include "test_gradient.h"
 #include "test_gui.h"